relax SVN archive

Removed the call to the data_init() method.

Converted the read function to the new relax design.

Converted all class methods into module functions, and deleted the class.

Added a module docstring.

Copyright notice update.

Converted the read() method to the new relax design.

Fixed the paths to the data files in the relaxation curve fitting script.

Enabled the relaxation curve fitting system test.

This was done by writing a small method, test_curve_fitting(), which executes the relax_fit.py
script.

Removed the commented out file writing user function.

Fixed the data pipe creation.